Uhh here we go XD Some could just move into my camp. I adopt all strays, and I would just love to have more of them.
Also I agree on I'd just want more content for our existing flock, they are all awesome and there needs to be more of them, rather than more companions with too little content.
But in the spirit of the question:
Raphael - I have no idea how that would work but I cant get enough of that stupid devil and gosh I would love to romance my fav pillow princess.
Dammon - he is just awesome! And sweet. And strong. And I want him to hook up with Karlach.
Rolan - yeah yeah I dont care he is awesome and Id love having him in my party.
Zevlor - look we have Jaheira but Id love to have more middle aged companions. I mean Halsin is theoretically middle aged but Zevlor has just this little something. Maybe its because we see more of Zevlor. Halsin seems to have hardly any content. Maybe I am just old, maybe its the horns. I just like my people with horns.
Alfira - we desperately need a Bard companion and she is awesome and can sing. Imagine her singing in the background every battle!
Barcus - the worst adventurer you could have, but gods it would be hilarious!
Abdirak - tbh before BG3 I did not read into dnd lore at all but I didnt get evil godess at all from our interaction with him. I'd really have loved to learn more about him and how and why he worships Loviatar. Super interesting and again, I adopt all strays. I'll make a village of this camp yet.
Lucretious - fabulous, necromancer, what more do I have to say.
I am not to keen on Nettie but I'd have loved a fem Dwarf companion.